TDA19978AHV datasheet(10/38 Pages) NXP

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TDA19978A_3

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Product data sheet

Rev. 03 — 16 April 2010

10 of 38

NXP Semiconductors

TDA19978A

Quad HDMI 1.3a receiver with digital processing

8.4 Equalizer

The auto-adaptive equalizer automatically measures and selects the settings which

provide the best signal quality for each cable. This improves signal quality and enables

the use of cable lengths up to 25 m (laboratory tested, contact NXP for detailed

information). The equalizer is fully automatic and consequently does not need any

external control.

8.5 Activity detection

The TDA19978A uses activity detection to automatically select the active HDMI input. An

internal, fully programmable, frequency filter controls activity detection. It sees only the

activity on the HDMI inputs with a frequency range between minimal 22.5 MHz and

maximal 205 MHz.

This activity detection can generate an interrupt enabling users to manage each HDMI

input.

8.6 High-bandwidth digital content protection

The HDMI receiver also contains the HDCP decryption function. The keys provided by the

One Time Programmable, non-volatile memory in encrypted format are decrypted and

then stored in the HDCP module. This is particularly suitable for repeater applications.

The TDA19978A controls all HDCP repeater functions based on the HDCP 1.2

specification.

Four DDC-buses HSCLA/HSDAA; HSCLB/HSDAB; HSCLC/HSDAC and HSCLD/HSDAD

are integrated into the HDCP function, one bus for each HDMI input. The DDC-bus

connected to the HDCP block is automatically selected based on the active HDMI input.

The unused inputs are disconnected from the DDC-bus (no acknowledge). No additional

CPU processing is required because the authentication phase and the rekey calculation

are fully managed by the TDA19978A.

8.7 Color depth unpacking

In Deep Color mode, the TDA19978A receives several fragments of a pixel group at the

HDMI link frequency. This block translates the received pixel group into pixels at the pixel

frequency. This operation is fully automatic and does not need any external control.

8.8 Derepeater

The HDMI source uses pixel repetition to increase the transmitted pixel clock for

transmitting video formats at native pixel rates below 25 megapixels per second or to

increase the number of audio sample packets in each line. The derepeater function

discards repeated pixels and divides the clock to reproduce the native video format.

8.9 Upsample

The HDMI source can use YCbCr 4:2:2 pixel encoding which enables the number of bits

allocated per component to be increased up to 12. The upsample function transforms this

12-bit YCbCr 4:2:2 data stream into a 12-bit YCbCr 4:4:4 data stream by repeating or

linearly interpolating the chrominance pixels Cb and Cr.

Upsampling mode is selected using the I2C-bus.

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